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477 results about "Weak base" patented technology
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On dissolving in water, a weak base does not dissociate completely and the resulting aqueous solution contains OH- ion and the concerned basic radical in a small proportion along with a large proportion of undissociated molecules of the base.
Process for production of steviosides from stevia rebaudiana bertoni
A process for the production of steviosides from Stevia rebaudiana Bertoni includes extraction of comminuted plant material by directly injecting steam into the extractor followed by filtration to get aqueous extract and alkali treatment to remove unwanted compounds in the form of precipitate. The treated aqueous extracted was filtered and the filtrate was first treated with gel or macroporous strong acid cation exchange resin and then with gel or macroporous weak base anion exchange resin. The aqueous eluant containing steviosides was concentrated to obtain purified steviosides.
Owner:COUNCIL OF SCI & IND RES
Process for synthesizing weakly alkaline anionic exchange resin with double functions and superhigh cross-linking
A series of ultrahigh-cross-linked weakly alkaline-anionic exchange resin with both adsorption and exchange functions, which has different specific surface areas and exchange capacities, is prepared from low-cross-linked macroporous polystyrene through chloromethylation, cross-linking reaction, where the nitrobenzene or substituted nitrobenzene is used as solvent and the Lewis acid is used as catalyst, and amination by dimethylamine.
Owner:南京大学环境学院
Environmental protection urea-formaldehyde resin and preparation method thereof
InactiveCN101265314ALow free formaldehyde contentExtended shelf lifeAldehyde/ketone condensation polymer adhesivesThermal waterWeak base
A novel environmental protective urea-formaldehyde resin and a preparation method belong to the field of wood processing adhesives. The urea-formaldehyde resin is formed by the reaction of urea, formaldehyde, aldehyde, one or more stabilizers and modifier according to the route of weak base-weak acid-weak base. The method firstly controls the F / U feed ratio, the pH value and the temperature during the reaction process to reduce the content of free formaldehyde in the resin; then the aldehyde is introduced to allow the resin to generate the stable alkyl ether (-(CH2)n-O-(CH2)n-) structure, thus reducing the content of methylene-ether bond (-CH2-O-CH2-) in the resin structure, simultaneously reducing the using amount of the formaldehyde and further greatly reducing the release amount of the formaldehyde during the using process of a plate from the two aspects; in addition, the introduction of a long chain and polyaldehyde can ensure the resin to have great bonding strength and water resistance. The urea-formaldehyde resin which is prepared by the invention has the advantages of low content of free formaldehyde, simple process, low cost, etc., the release amount of the formaldehyde of the plate which is prepared by using the adhesive achieves the E0 level standard, and the high bonding strength can be maintained after being boiled in hot water.
Owner:BEIJING UNIV OF CHEM TECH
Production method for electrolytic manganese dioxide
ActiveCN102220490AWide adaptabilityShort processElectrolysis componentsCleaning using liquidsSlurryManganese oxide
The invention relates to a production method for electrolytic manganese dioxide. The method comprises the following steps of: A. preparing a mixed liquid of crude manganese sulfate and slurry; B. neutralizing the mixed liquid to remove iron; C. carrying out three-time deep purification on the crude manganese sulfate solution including first purification to remove heavy metals, second purification to remove trace element molybdenum and third purification to remove calcium sulfate and magnesium sulfate; D. electrolyzing; E. rinsing including six steps of washing acid with hot water, rinsing with a weak base, rinsing with a strong base, washing base with hot water, backwashing with a diluted acid and rinsing with hot water; F. milling; and G. mixing to obtain an electrolytic manganese dioxide product. According to the invention, low-grade manganese oxide ore is used as a main raw material to prepare a manganese sulfate solution, the manganese sulfate solution is subjected to deep purification treatment to obtain a high-purity electrolyte, high-performance electrolytic manganese dioxide special for mercury-free alkaline cells and automobile power cells can be respectively produced under different electrolysis conditions, and the obtained electrolytic manganese dioxide product has low impurity content and high quality.
Owner:GUANGXI GUILIU CHEM CO LTD +1
Mixed ionic liquid solution special for absorbing SO2 gas and preparation method thereof
InactiveCN101745290AIncrease molar absorptionLow viscosityDispersed particle separationSulfur compoundsProtonationSulfolane
The invention relates to mixed ionic liquid formula solution, which consists of an ionic liquid A, an ionic liquid B and a mixed solvent C, wherein the positive ion of the ionic liquid A is the N,N-dialkyl imidazole positive ion or the N,N,N,N-tetra alkyl quaternary amine positive ion, while the negative ion thereof is the monobasic carboxylic negative ion; the positive ion of the ionic liquid B is the protonated alkylamine positive ion, while the negative ion thereof is the monobasic or binary or ternary carboxylic negative ion; and the mixed solvent C is aqueous solution of water, polyethylene glycol, polyglycol ether, propylene carbonate or tetramethylene sulfone. The mixed ionic liquid formula solution of the invention is strong base-weak acid and weak base-weak acid mixed salt solution, has wide pH buffering capacity, and can greenly efficiently absorb the SO2 gas in a reversible cycle mode. The mixed ionic liquid formula solution of the invention is adopted as a SO2 absorbent so that the requirement for the equipment required by SO2 absorption is simple, the operation condition of absorbing and desorbing SO2 is mild, the desulfurization efficiency is high, and the problems of waste solution and wastewater discharge and the like do not exist. The invention also discloses a preparation method for the mixed ionic liquid formula solution.
Owner:NANJING UNIV +1
Preparation method of carbon quantum dots
InactiveCN108083259ASimple preparation processEasy access to raw materialsNanotechnologyNano-carbonEnvironmental resistanceAgricultural residue
The invention provides a preparation method of carbon quantum dots and belongs to the technical field of preparation of nano luminescent materials. The preparation method comprises the following steps: weighing forestry and agricultural residues, kitchen garbage and mixture of one or more of vegetables, fruits, grains, flowers and Chinese herbal medicines in a ratio of parts by weight of 1:(1-100):(0.5-100) as raw materials; pulverizing the weighed raw materials, sieving the pulverized raw materials, performing uniform mixing, and adding organic acid or strong base or weak base to the treatedmixed liquid; and performing ultrasonic treatment, hydrothermal treatment and centrifugal treatment to obtain a solution, putting the obtained solution after centrifugal treatment into a dialysis bag,and putting the dialysis bag in a beaker filled with distilled water to be subjected to dialysis treatment so as to obtain the carbon quantum dots. The yield of the carbon quantum dots provided by the invention is 50-90%, and the sizes of the prepared carbon quantum dots are 1-2nm; and compared with the existing preparation method of the carbon quantum dots, the preparation method provided by theinvention has the advantages that the preparation process is simple, the raw materials are easy to obtain, and the preparation method is environmentally friendly and harmless.
Owner:史书亭
Water based lithium secondary battery
InactiveUS20100136427A1Large capacityInhibit currentAlkaline accumulatorsCell electrodesWater basedStrong acids
The present invention provides a water based lithium secondary battery that can inhibit deteriorations in capacity owing to charge-and-discharge operations and maintain a high capacity even after it is charged and discharged repeatedly. The water based lithium secondary battery includes a positive electrode, a negative electrode, a separator sandwiched between these, and an aqueous electrolyte solution obtained by dissolving an electrolyte made of a lithium salt in a water based solvent. As the water based solvent, a pH buffer solution is employed. The buffer solution is obtained by dissolving an acid and its conjugate base's salt, a base and its conjugate acid's salt, a salt made from a weak acid and a strong base, a salt made from a weak base and a strong acid, or a salt made from a weak acid and a weak base in water.
Owner:TOYOTA CENT RES & DEV LAB INC
Active seaweed fertilizer and production method thereof
The invention relates to an active seaweed fertilizer and a production method thereof. The preparation method comprises the steps of digestion, enzymolysis, post-treatment and the like. The production method is characterized in that the digestion of weak base is performed before complex enzymes are added, so that large damages on active substances in seaweeds can not be caused, and the preliminary extraction of the seaweeds can be facilitated, so that the dosage of the complex enzymes can be reduced. The seaweed fertilizer product is rich in alginic acid, gibberellin, zeatin and the other active substances, can effectively promote the growth and development of plants and improve the plant yield, and meanwhile greatly keeps the natural adverse resistance ingredient glycine betaine, phenol compounds and the like in the seaweeds, so that the improvement of the stress resistance of the plants can be facilitated.
Owner:领先生物农业股份有限公司
Production of medium-high voltage anode corrosive foil
InactiveCN101029413AReduce manufacturing costReduce environmental costsCapacitor electrodesElectrolysisPhosphoric acid
Production of high-voltage anode anti-corrosion foil is carried out by taking A1 with purity>99.99% and cubic tissue structure>=95% as raw materials, pre-treating, first electrolyzing, first intermediate treating, second electrolyzing, second intermediate treating, third electrolyzing and after-treating. It consists of phosphoric acid, hydrochloric acid, sulfuric acid and nitric acid etc. acid treating liquid, weak base and strong base etc. treating liquid, sulfuric acid, hydrochloric acid, nitric acid, weak-acid chlorine salt and corrosion inhibitor cell liquor. It has good appearance, better electrostatic capacity and capacity difference. It can be used for medium-high voltage section dendritic holes by cell-liquor different properties.
Owner:DONGGUAN HEC CONDENSER CO LTD
Magnetic microsphere resin for removing nitrate nitrogen selectively, and preparation method thereof
ActiveCN102430433AHigh base exchange capacityAccelerated settlementWater/sewage treatment by ion-exchangeAnion exchangersOil phaseStructural formula
The invention discloses magnetic microsphere resin for removing nitrate nitrogen selectively, and a preparation method thereof, and belongs to the field of ion exchange resin. The resin consists of a resin skeleton, and magnetic granules wrapped in the resin skeleton; and the resin skeleton has a basic structural formula shown in the specification, wherein B is a quaternary ammonium salt group for adsorbing the nitrate nitrogen selectively, the saturation magnetization intensity of the quaternary ammonium salt group is between 5 and 30 emu / g, the exchange capacity of strong base is between 3.0 and 4.5 mmol / g, the exchange capacity of weak base is between 0.5 and 1.5 mmol / g, and the average grain diameter of the resin is between 50 and 500 micrometers. The resin is synthesized by a suspension polymerization method; acrylate monomers are mixed with a pore-forming agent and an initiator to form an oil phase; after being mixed with the magnetic granules uniformly, the mixture is subjectedto suspension polymerization with an aqueous phase mixed with a dispersing agent to form the magnetic polymer granules, and the magnetic polymer granules are subjected to aminolysis and alkylation toform the resin serving as a finished product. The resin can adsorb negative ions such as nitrates, nitrites and the like in a water body selectively, so the magnetic microsphere resin has a bright application prospect in fields of drinking water treatment, groundwater remediation and the advanced treatment of urban domestic sewage.
Owner:NANJING UNIV +1
Water treatment process for perchlorate, nitrate, chromate, arsenate and other oxyanions for using weak-base anion exchange resins
ActiveUS20070114178A1Reduce pumping costsImprove chemical efficiencyOrganic anion exchangersIon-exchanger regenerationSelenateIon exchange
The invention consists of a water treatment process using selective and regenerable weak base anion exchange resins to remove any number of complex anions, especially oxyanions including perchlorate, nitrate, chlorate, arsenate, selenate, and chromate, from aqueous solutions. The treatment process is comprised of three key processes including 1) pretreatment to lower pH, 2) ion exchange, and 3) post treatment to adjust pH and alkalinity. The invention also includes processes for regenerating weak base anion resins and treatment of the residuals generated. This invention employs pressurized treatment, carbon dioxide management, and reuse of regenerating solution to minimize pumping and treatment costs.
Owner:APPLIED RES ASSOCS INC +1
Preparation method of triethyl citrate
ActiveCN102079704ALess side effectsHarm reductionOrganic compound preparationCarboxylic acid esters preparationLiquid productPhenolphthalein
The invention relates to a preparation method of triethyl citrate. The preparation method is as follows: by deeply studying the preparation process of triethyl citrate, setting a reaction feed ratio; then adding catalyst to perform reflux reaction; then utilizing phenolphthalein as an indicator and sodium hydroxide to perform titration to determine the reaction end point; utilizing weak base to neutralize less acidic materials in the obtained product, and eluting sodium carbonate with purified water; and finally utilizing activated carbon to decolor, thus obtaining the pure triethyl citrate product. Compared with the prior art, the preparation method provided by the invention has the advantages that the reaction end point is strictly controlled, unnecessary side reactions are reduced, thereduction of the product quality and the waste of cost caused by inadequate reaction or too long reaction time can be avoided; by controlling the temperatures of the processing steps, the damages caused by side reactions are reduced as far as possible; by selecting the decoloring mode, an ideal, colorless and transparent liquid product can be obtained; and the product quality is above the national standard: especially the acid value is controlled to be about 0.2 while the acid value of the national standard is 1.0, and the stability of the product when stored for a long time is higher than those of the like products.
Owner:蚌埠丰原涂山制药有限公司
Mixing type nonisocyanate polyurethane and preparation method thereof
The invention relates to hybrid non-isocyanate polyurethane which is prepared through adopting the following method: epoxidized soybean oil and weak base catalyst are added in a reaction kettle, and then carbon dioxide gas is pumped in; at the action of reaction temperature, reaction pressure and stirring, reaction is started, and cyclic carbonate is generated after the reaction; the cyclic carbonate is mixed with epoxy resin and organic base catalyst is added; then, the mixture is mixed with primary amine compound so as to be formed into sheets; finally, sulfuration is carried out under the condition of sulfuration with the product placed for 7 to 9 days at room temperature. The hybrid non-isocyanate polyurethane has the advantages that: the hybrid non-isocyanate polyurethane is synthesized through the mixing and the reaction of natural regenerable vegetable resource and epoxy resin, thereby reducing the dependence on petrochemical resource, making full use of the regenerable vegetable resource and carbon resource and reducing environmental pollution.
Owner:SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
Modified urea-formaldehyde resin adhesive for concrete formwork and production method of adhesive
ActiveCN102391805AImprove performanceEasy to operateAldehyde/ketone condensation polymer adhesivesWood veneer joiningStrong acidsMelamine
The invention discloses a modified urea-formaldehyde resin adhesive for a concrete formwork, which is mainly prepared from the following raw materials in parts by weight: 50 to 60 parts of formaldehyde with the mass concentration of 37 percent, 20 to 30 parts of urea with purity of 98 percent, 6 to 8 parts of melamine, 0.1 to 0.2 part of tackifier and 0.2 to 0.3 part of accelerant. The adhesive has an Uron-ring improved structure, so that the waterproofness of the formwork can be improved. The invention also discloses a production method of the adhesive, which comprises three steps of strong acid, weak acid and weak base. The reaction between the formaldehyde and the urea under a strong acid reaction condition can be effectively controlled by controlling temperature, pH value, charging speed, charging time and molar ratio. Meanwhile, two endpoint control indexes which are simple and convenient and are easy to operate are provided, and therefore processing implementing can be controlled conveniently and accurately.
Owner:GUANGXI UNIV
Method for separating platinum palladium iraurita
InactiveCN1400322AAchieve mutual separationEasy to separateProcess efficiency improvementIridiumThiourea
The present invention uses weak base phenylethylene series trialkylamine type anion-exchange resin as fixed phase and uses hydrochloric acid medium as mobile phone to implement coarse separation of platinum, palladium, iridium and gold from base metal, adopts dilute hydrochrolic acid, water and EDTA to elute base metal, and utilizes sulfocyanate+ascorbic acid solution, hydrochloric acid equilibrated methyl isobutanedione, NH4Cl+NH3.H2O solution and HCl+thiourea+thiourea+methyl alcohol solution to selectively shower-wash iridium, gold, palladium and platinum, and its chromatographic column canbe regenerated by using hydrochloric acid. Its resolution is good, the baseline separation can be obtained, and their recoveries are above 95%.
Owner:BEIJING GENERAL RES INST OF MINING & METALLURGY
Materials, filters, and systems for immobilizing combustion by-products and controlling lubricant viscosity
InactiveUS20060261004A1Exchange capacity can be maximizedEconomic benefitWater/sewage treatmentMachines/enginesCombustionFiltration
A chemical filter for use within an internal combustion engine lubrication system. The chemical filter employs filtration media including particles having internal pores and interstitial pores formed between adjacent particles. The internal pores and the interstitial pores collectively define filtration media pores, and a strong base material is associated with at least some of the internal pores. The filtration media has a surface area greater than or equal to 25 m2 / gm that is derived from filtration media pores that are large enough to receive a combustion acid-weak base complex contained within oil flowing through the chemical filter. This enables an ion-exchange process to occur that immobilizes the combustion acids and regenerates the weak base, so as to extend the time intervals between oil drains, among other benefits.
Owner:LUTEK
Method for preparing magnetic spinel ferrite hollow ball in one-step method
InactiveCN101693616AEasy to operateThe reaction steps are simpleNanostructure manufactureInorganic material magnetismSolventHigh pressure
The invention relates to a method for preparing magnetic spinel ferrite hollow ball in one-step method, which belongs to the technical field of magnetic nano material preparation technology. The preparation method comprises the following steps: utilizing polyatomic alcohol as dissolvent, dissolving tervalence malysite and other divalent inorganic metal salt into polyatomic alcohol, adding right amount of weak base and surface activator, evenly stirring to form brown and transparent mixed solution, placing the solution into a high-pressure stainless steel autoclave which utilizes polytetrafluoroethylene as inside lining, filling volume is 50%-80%, and the solution is sealed in the high-pressure stainless steel autoclave, products are separated by magnets when the solution is reacted 12-24 hours under 160-250 DEG C, the products are washed by water and alcohol, and are dried, thereby getting magnetic spinel ferrite MFe2O4 (M=Co, Ni, Mn, Zn) hollow balls. The method has simple operation, can self-assemble to form a hollow ball structure without templates, does not need subsequent treatment (removal of templates), and is suitable for industrial production of bigger yield, and the products which are got have single material phase and stable property.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Changed condition indicator
InactiveUS20070151502A1Thermometer detailsThermometers using mean/integrated valuesStrong acidsThreshold temperature
A system and method for indication of temperature exposures beyond a set of predetermined limits employs the salts of weak acid-strong base or of a strong acid-weak base compound as reactants. A device includes a housing and capsule. A first reactant and a liquid are included within the capsule. The liquid is chosen such that it expands upon freezing. The capsule is sized such that when the liquid freezes and expands, the capsule fractures. A second reactant is provided within the housing. The location of the second reactant and the method of attaching (if any) the second reactant to the housing may take various forms. When the liquid within the capsule freezes, it expands and fractures the capsule. Upon thawing, the reactant within the capsule escapes and mixes with the reactant located outside the capsule. A second embodiment is a time-temperature indicator. A flexible housing is used, allowing the user to manually deform the housing to fracture a capsule enclosed therein. The reactants combine to produce a color. The color is chosen to be a different color than the housing, allowing a person viewing the indicator device to quickly and easily determine the status of the object being monitored. The threshold temperature at which the device will indicate a changed condition may be varied. Exemplary temperatures include below the freezing temperature, at the freezing temperature, and above the freezing temperature. The capsule composition may be varied such that it melts at a predetermined temperature. Thus, the device may also be used to indicate whether a high temperature has been met or exceeded.
Owner:THERMOPROX
Preparation of urea-formaldehyde resin for environment-friendly artificial board
InactiveCN101475676AIncrease the lengthLow free formaldehyde contentAldehyde/ketone condensation polymer adhesivesEtherHydroxymethyl
The invention relates to a preparation method for a urea formaldehyde resin used for an environmentally friendly man-made panel. The preparation method comprises the following steps: taking a reaction route of weak base-weak acid-weak base, firstly carrying out the polyaddition of formaldehyde and urea to generate dimethylolurea through a plurality of condensation polymerizations based on the traditional one filling reaction, then carrying out the gradual condensation in an acid medium to generate a linear urea formaldehyde resin, finally gradually adding urea molecules as connection means to improve the length of a linear molecule, reducing the content of free formaldehyde in the urea formaldehyde resin glue, directly synthesizing the green low formaldehyde urea formaldehyde resin glue product, improving the condensation degree and reducing the content of hydroxymethyl, methylene ether and hemiformal through step control, promoting the formation of body type organic micromolecules via microscope, adding a tiny amount of formaldehyde capture agent at the solidification phase to remove residual free formaldehyde, and setting the content of the free formaldehyde in the product to be less than or equal to 0.1 percent, and finally making the product performance technical indicators reach the domestic leading level.
Owner:JIANGSU POLYTECHNIC UNIVERSITY
Mixed Amine and Non-Nucleophilic Base CO2 Scrubbing Process for Improved Adsorption at Increased Temperatures
ActiveUS20120060686A1Adjust pressure stabilityAdjust temperature stabilityDispersed particle filtrationCarbon compoundsNon-nucleophilic baseDesorption
A CO2 amine scrubbing process uses an absorbent mixture combination of an amine CO2 sorbent in combination with a non-nucleophilic, relatively stronger, typically nitrogenous, base. The weaker base(s) are nucleophilic and have the ability to react directly with the CO2 in the gas stream while the relatively stronger bases act as non-nucleophilic promoters for the reaction between the CO2 and the weaker base. The sorption and desorption temperatures can be varied by selection of the amine / base combination, permitting effective sorption temperatures of 70 to 90° C., favorable to scrubbing flue gas.
Owner:EXXON RES & ENG CO
Weak base ternary composite reservoir oil displacement composition with formulated surfactant and application thereof
ActiveCN103224777AImprove handling difficultyEnhanced overall recoveryFluid removalDrilling compositionAdditive ingredientGround system
The invention provides a weak base ternary composite reservoir oil displacement composition with formulated surfactant and application thereof, and the ternary composite reservoir oil displacement composition contains a formulated surfactant, which is formulated by mahogany petroleum sulfonate and HABS according to 3:1 weight ratio; 0.4 wt.% and 0.6 wt.% of sodium carbonate; polymer. The ternary composite reservoir oil displacement composition provided by the invention has synergism between each ingredient, and can the recovery efficiency is increased by more than 20%; simultaneously because the reservoir oil displacement composition of the present invention does not have highly basic sodium hydroxide, and the sodium carbonate concentration in the prior art weak base ternary system is reduced, and the possibility for dissolving rock in stratum is reduced, thereby solving the lifting system problem caused by scaling in the extraction well and reducing treatment difficulty of the ground system.
Owner:PETROCHINA CO LTD +1
Method for processing hexavalent chromium contained wastewater with ion exchange resin
InactiveCN101172676AClear structureAchieve governanceWater contaminantsWater/sewage treatment by ion-exchangeResource recoveryPolystyrene
The invention relates to a method of treating sexavalent chrome waste water by ion exchange resin, which belongs to the technology of treating the sewage with chrome. The resin used in the method is the polystyrene acyl amidocyanogen weak-base ion-exchange resin. Treating waste water containing chrome by use of the resin includes the following steps that: waste water containing chrome is pretreated to remove the infusible impurities; and then, pretreated waste water passes through the exchange post filled with the ion exchange resin in a flow rate ranging from 3BV / h to 6BV / h in room temperature; the absorbed resin is reproduced by use of the alkali solution with mass fraction ranging from 2 percent to 10 percent, and sexavalent chrome is recycled. After being treated by the invention, the concentration of the sexavalent chrome in waste water drops from 3500mg / L to 0.5mg / L, which can be discharged in comply with the standard; by reproducing, the recovery rate of the sexavalent chrome reaches up to 90 percent to 95 percent, thereby realizing recovering and comprehensively utilizing the resources while treating the waste water.
Owner:NANJING UNIV OF TECH
Method for preparing water-soluble polyimide sizing agent for polyimide fiber and application thereof
ActiveCN105064038AGuaranteed high temperature performanceAvoid matching problems usingFibre typesResin matrixTemperature resistance
Provided are a method for preparing a water-soluble polyimide sizing agent for polyimide fiber and application thereof. The method comprises the steps of slowing adding triethylamine, triethanolamine or other weak base reagents into a polyamic acid solution, fully reacting and forming a polyamic acid salt solution; precipitating the polyamic acid salt solution in a poor solvent, and fully removing a remaining solvent and then obtaining polyamic acid salt solid; and dissolving the solid in water to obtain the water-soluble polyimide sizing agent for the polyimide fiber. The polyimide fiber soaked with the sizing agent undergoes the steps of dehydration through a high-temperature heat furnace and imidization to finish fiber sizing. The sizing agent can improve surface energy of fiber, the wettability and interface bonding strength between the sizing agent and resin matrix are improved, the wear resistance and collection property of the fiber can be improved, the high temperature resistance of the fiber in use is effectively guaranteed, and the sizing agent is approximate to zero pollution in the application process and has the use characteristic of environmental friendliness.
Owner:JIANGSU XIANNUO NEW MATERIAL TECH
Leakage-proofing process for exploiting hot-dry-rock geothermal resource by injecting CO2 (supercritical carbon dioxide)
InactiveCN104675360AOther heat production devicesGeothermal energy generationSaline waterHigh concentration
The invention relates to the field of geothermal exploitation and provides a leakage-proofing process for exploiting a hot-dry-rock geothermal resource by injecting CO2 ( supercritical carbon dioxide). According to the leakage-proofing process, four inorganic salt precipitation generating mechanisms including (1) mixing a high-concentration salt solution with a precipitation inducer; (2) mixing a high-concentration inorganic salt solution with weak-acid / weak-base gas; (3) mixing a high-concentration inorganic salt solution with another high-concentration inorganic salt solution; (4) evaporating and carrying residual stratum water in surrounding rocks by the supercritical CO2 when the supercritical CO2 flows are adopted, the supercritical CO2 is injected into front slugs / rear slugs of a hot-dry-rock reservoir stratum alternatively, the slugs are displaced by the supercritical CO2 till to the position close to surrounding rocks in a leaking area, the solutions in the slugs are mixed to generate certain physical-chemical reactions so as to generate precipitation, and the generated precipitation is used to block off rock pore cracks. By the aid of combination of evaporating and carrying functions of the supercritical CO2, the rock pore cracks are further blocked off by the precipitation. The leakage-proofing process for exploiting the hot-dry-rock geothermal resource by injecting the supercritical CO2 is good in effect after being verified by experiments.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Deep purification method for removing micro-tungsten from high-concentration molybdenate solution
A method for completely cleaning high concentration molybdate solution by removing trace tungsten comprises the steps of pre-adjusting pH value of molybdate solution containing trace tungsten, allowing tungstate ions to completely polymerize to form polytungstate ions, and performing selective adsorption of tungsten with adsorption bed filled with macroporous weak base anion exchange resin, so as to completely remove tungsten from molybdate solution.
Owner:CENT SOUTH UNIV
Method for preparing electronic grade ultrahigh purity hydrofluoric acid
The invention provides a method for preparing electronic grade ultrahigh purity hydrofluoric acid. The method comprises the following technical steps: (1) pretreating industrial anhydrous hydrogen fluoride; (2) treating in a reboiler; (3) distilling; (4) cooling; (5) absorbing; (6) performing ion exchange adsorption; and (7) filtering. The invention has the following beneficial effects: hydrogen peroxide is used to oxidize As<3+>, thus the problem that As<3+> is difficult to remove can be completely solved; chelating agent and a weak-base anion-exchange resin system are adopted to deeply remove a small amount of metal ions and impurities; through secondary filtration, all the indexes of hydrofluoric acid can meet the requirements of the electronic grade ultrahigh purity agent; and the method of the invention can be used for large-scale production, and the technology is stable, is easy to control and is suitable for popularization.
Owner:SUZHOU CRYSTAL CLEAR CHEMICAL CO LTD
Materials and processes for reducing combustion by-products in a lubrication system for an internal combustion engine
InactiveUS7520371B2Minimizes engine depositsEfficient emissionsMachines/enginesLubricant mounting/connectionSolubilityExternal combustion engine
Owner:LUTEK
Process of separating acetylpropionic acid with active carbon
InactiveCN101020629AHigh yieldReduce manufacturing costCarboxylic compound separation/purificationLevulinic acidAlcohol
The present invention is process of separating acetylpropionic acid with active carbon from the mixture solution of acetylpropionic acid and formic acid or acetylpropionic acid containing hydrolysate obtained through hydrolyzing sacchraide. The mixture solution or hydrolysate after being chromatographically separated in alkali cationic column and decolorized in macroporous resin is passed through adsorbing active carbon column to adsorb formic acid, acetylpropionic acid is eluted with water solution of alcohol, and the eluted solution is decompression concentrated to obtain high content acetylpropionic acid product. The present invention has complete separation of acetylpropionic acid from formic acid, high yield, low production cost, easy industrial application and other advantages.
Owner:ZHEJIANG UNIV
Preparation method of laser modified titanium dioxide photocatalyst
InactiveCN101391210AEasy to manufactureSolve the load problemOrganic-compounds/hydrides/coordination-complexes catalystsPolyesterFiber
The invention discloses a preparation method of a laser modified titanium dioxide photocatalyst, which belongs to the technique field of environmental pollution treatment and the research field of new energy sources, and the method comprises the following steps: 1) surface treatment of a high-strength and high-elasticity porous polyester fiber net; 2) loading the titanium dioxide photocatalyst; and 3) modification of a titanium dioxide film by laser. The method is to sequentially carry out the protective sorting to the polyester fiber net according to the cleaned fiber net surface, then coat a film on the fiber net surface by using a sol-gel-coating method and taking tetra-iso-propyl titanate and isobutyl alcohol as raw materials under the weak base condition, and modify the film in a textile laser processor. The invention has advantages of extensive sources of raw materials, simple process, low cost, good stability of the prepared titanium dioxide film, and high photo-catalytic activity and efficiency, and has the antifouling, self-cleaning, antibacterial and air-cleaning effects, and the method can be used for the degradation of environmental harmful substance, and can serve as air purification material and dyeing wastewater treatment photocatalysis material.
Owner:DONGHUA UNIV
Sulfur resitant cladded titania-alumina supports
ActiveUS20120190541A1Improve efficiencyExtend effective lifeDispersed particle separationCatalyst activation/preparationParticulatesSlurry
The present invention is directed to a method of forming titania clad high surface area alumina suitable as a support for forming noble metal catalysts. The resultant catalysts exhibit resistance to poisoning by sulfurous materials and, therefore, are useful in applications directed to internal combustion engine emission conversion and the like. The present invention provides a commercially feasible and cost effective method of forming a highly desired support for noble metal catalyst application. The process comprises forming a slurry of porous alumina particulate suitable as a catalyst support for the intended application, mixing said slurry with a solution of titanyl sulfate having a pH of about 1, increasing the pH of the mixed slurry / solution at a slow rate of from 0.05 to 0.5 pH unit per minute to a pH of ≦4 by the addition of a basic solution, allowing the resultant slurry to age for a period of from 10 to 120 minutes, separating the treated porous alumina particulates and washing same free of sulfate with a weak base, drying and calcining said particulates to produce titania clad alumina particulate product. The resultant material exhibits a normalized sulfur uptake of less than about 45 μg / m2-sample. Such material can subsequently be coated with a noble metal to form the catalyst material.
Owner:WR GRACE & CO CONN
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